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From: Dave C. on 19 Dec 2009 19:40

> I'm not sure if there was any specific reasoning as to why they
> started off putting them on top in the first place, but *that*
> decision seems a little odd.

Many computers were cooled with only one cooling fan. That is the one
that was mounted on the back of the power supply. Air would be pulled
through the case, then through the power supply, then exhausted out the
back of the power supply. Therefore it made sense for the bottom/back
of the PSU to be mounted as high as possible in the case. That's the
direction all the hot air was going anyway, so it made cooling more
efficient to have the PSU way up top.

The PSU still assists somewhat in cooling the case...and more
importantly the components in the case. The only advantage to having
the PSU bottom mounted is that the PSU fan will be drawing more cool
air into the PSU itself. In turn, this means you need a shitload of
airflow to cool the case (and components like the northbridge, CPU and
GPU in particular), because much of your cool intake air is now going
down low where it's not cooling a damned thing. -Dave

From: Dave C. on 19 Dec 2009 19:42

> >I think it is wrong to put the power supply in the bottom of an ATX
> >case. It's just plain stupid to design a box that most customers
> >will have a problem with. -Dave
>
> Wrong... Why? Other then the cable length issue, what's your
> objection?

You need a shitload of extra fans (adding extra noise) to
counter-balance the fact that much of your cool intake air is going in
the wrong direction to cool anything. -Dave

--
Dave C. <noway(a)nohow.never>
From: ShadowTek on 20 Dec 2009 10:55
On 2009-12-20, DevilsPGD <DeathToSpam(a)crazyhat.net> wrote:
>
> The concept of separate head-zones is handy too, as is the better
> airflow at and around the CPU.

One thing that's nice about my current case is there's a 23cm fan on the
top exhausting air outward. Having the PS on the bottom allows for that
large flow of uninterrupted air making its way out of the top, which also
seems natural since "up" is the direction that hot air wants to go
anyway.
From: ShadowTek on 20 Dec 2009 11:02
On 2009-12-20, Dave C. <noway(a)nohow.never> wrote:
>
> Many computers were cooled with only one cooling fan. That is the one
> that was mounted on the back of the power supply. Air would be pulled
> through the case, then through the power supply, then exhausted out the
> back of the power supply. Therefore it made sense for the bottom/back
> of the PSU to be mounted as high as possible in the case. That's the
> direction all the hot air was going anyway, so it made cooling more
> efficient to have the PSU way up top.

Oh yeah, my first computer was like that. I forgot all about the fact
that they didn't use seperate case fans. lol


> The PSU still assists somewhat in cooling the case...and more
> importantly the components in the case. The only advantage to having
> the PSU bottom mounted is that the PSU fan will be drawing more cool
> air into the PSU itself. In turn, this means you need a shitload of
> airflow to cool the case (and components like the northbridge, CPU and
> GPU in particular), because much of your cool intake air is now going
> down low where it's not cooling a damned thing. -Dave

Oh, my case has a shitload of airflow anyway. I've got a 23cm in the
top, another one of the side pushing in, 2 14cm fans on the front
cooling the 2 HD racks, and a 12cm in the rear pushing out.
From: ShadowTek on 20 Dec 2009 11:07
On 2009-12-20, Dave C. <noway(a)nohow.never> wrote:
>
> You need a shitload of extra fans (adding extra noise) to
> counter-balance the fact that much of your cool intake air is going in
> the wrong direction to cool anything. -Dave

In reference to all my case fans that I listed in a previous post,
they're very quiet. Actually, my graphics card fan is the only noticible
one of the bunch, and it's quite tollerable anyway.

*Actually*, my hard drives make *far* more noise than any of my fans
(not that my HDs are abnormally loud in any way).
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